package com.itheima.web.servlet;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/* 优化servlet*/
public class BaseServlet extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //  1.获取请求路径的uri
        String uri = req.getRequestURI();
        //  1.1截取请求路径字符串，获取最后"/"后的字段
        int index = uri.lastIndexOf("/");
        String methodName = uri.substring(index + 1);

        //  2.获取方法对象
        //  2.1获取访问对象的字节码文件
        Class<? extends BaseServlet> cls = this.getClass();
        //  2.2获取方法对象
        try {
            Method method = cls.getMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
            //  2.3执行方法
            method.invoke(this,req,resp);
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }

    }
}
